April 16, 2024
Babak Aghel

Babak Aghel

Academic rank: Associate professor
Address: Department of Chemical Engineering, Faculty of Energy, Kermanshah University of Technology (KUT), Imam Khomeini Highway, Kermanshah, Iran
Education: Ph.D in Chemical Engineering
Phone: 083-38305000 (1168)
Faculty: Faculty of Engineering

Research

Title
Experimental and modeling analyzing the biogas upgrading in the microchannel: Carbon dioxide capture by seawater enriched with low-cost waste materials
Type Article
Keywords
Biogas upgrading Carbon dioxide capture Water scrubbing Seawater Precipitates Microchanne
Researchers Babak Aghel، Ashkan Gouran، Sara Behaien، Behzad Vaferi

Abstract

There are multiple techniques to enhance the calorific value of biogas by removing impurities, especially carbon dioxide (CO2). This study used a T-shaped microchannel to purify biogas by seawater containing 0.1 wt% of Iranian modified clinoptilolite zeolite and several precipitates (i.e., water distillation, phosphogypsum, power plant clarifier unit). These additives increase the alkalinity and CO2 absorption ability of seawater. Effects of temperature, liquid flow rate, and biogas flow rate on the CO2 removal efficiency have been investigated. The response surface methodology is also employed to construct a quadratic model to predict the CO2 removal efficiency as a function of these variables. The -value for all variables was less than 0.05, indicating that all four models were significant. Moreover, according to R2 values ranging from 0.9920 to 0.9997, the experimental CO2 absorption values have acceptable agreement with the model predictions. The maximum CO2 capture by seawater solutions containing zeolite and precipitates of phosphogypsum waste, plant clarifier, and water distillation at 30 C, in a liquid flow rate of 150 ml/h and a gas flow rate of 50 ml/min was 96.85, 96.01, 92.99, and 90.23%, respectively. The results achieved in this study are essential for the appropriate design of a micro-reactor for biogas upgrading and understanding the effect of operating conditions on its CO2 removal efficiency.